$prefix-for-webkit: true !default;
$prefix-for-mozilla: true !default;
$prefix-for-microsoft: true !default;
$prefix-for-opera: true !default;


@mixin prefixer ($property, $value, $prefixes) {
  @each $prefix in $prefixes {
    @if $prefix == webkit and $prefix-for-webkit == true {
      -webkit-#{$property}: $value;
    }
    @else if $prefix == moz and $prefix-for-mozilla == true { 
      -moz-#{$property}: $value; 
    } 
    @else if $prefix == ms and $prefix-for-microsoft == true { 
      -ms-#{$property}: $value; 
    } 
    @else if $prefix == o and $prefix-for-opera == true { 
      -o-#{$property}: $value; 
    }
  }
}